closeup of head
It is much larger than any other North American clubtail, at 3.3 inches (84:mm), with black and yellow markings and green eyes. Males can be distinguished at a distance by their habit of curling their abdomens under while flying, forming a sideways J shape.
The dragonhunter is the only member of genus Hagenius. Its closest relatives are Asian dragonflies of genus Sieboldius, which are also sometimes called "dragonhunters". Together, the two genera form the subfamily Hageniinae.
The adult feeds on large insects, including darner and clubtail dragonflies, sometimes ambushing them from above. It also takes monarch butterflies, eating the thorax and abdomen first to avoid the greatest concentration of cardenolide toxins.
- ^ Kurt Mead. Dragonflies of the North Woods. Second edition. Duluth, MN:Kollath+Stensaas, 2009.
- ^ Dunkle, Sidney W. (2000). Dragonflies through Binoculars. New York: Oxford University Press. p.:176. ISBN:0-19-511268-7.
- ^ a b Needham, James G.; Minter J. Westfall, Jr.; Michael L. May (2000). Dragonflies of North America (rev. ed.). Gainesville, FL: Scientific Publishers. pp.:348–351. ISBN:0-945417-94-2.
- ^ Corbet, Phillip S. (1999). Dragonflies: Behavior and Ecology of Odonata. Ithaca, NY: Cornell University Press. pp.:281–282. ISBN:0-8014-2592-1.
- ^ White, DS; Sexton, OJ (1989). "The Monarch Butterfly (Lepidoptera: Danaidae) as Prey for the Dragonfly Hagenius brevistylus (Odonata: Gomphidae) ". Entomological News. 100 (3): 129–132. Retrieved 2007-07-17.
- Hagenius brevistylus , BugGuide